SELECT * FROM question_mgmt as q WHERE id=2857 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=50 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Complete the following chemical reactions.

(i) PbS(s)  +  H2O2(aq)   → 

(ii)  MnO-4(aq)  +  H2O2(aq)   →

(iii)  CaO(s)  +  H2O(g)  →

(iv) AlCl3(g)   +   H2O(I)   →

(v) Ca3N2(s)   +  H2O(I)  →

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Answer:

(i) PbS(s)  +  H2O2(aq)   →   PbSO4(s)  +  H2O(l)

H2O2 is acting as an oxidizing agent in the reaction. Hence, it is a redox reaction.

 

(ii) 2MnO-4(aq)  + 5H2O2(aq)   →  6H+(aq)    →  2Mn2+(aq)  +    8H2O(l)   +   5O2(g)

H2O2(aq) is acting as a reducing agent in the acidic medium, thereby oxidizing MnO-4(aq). Hence, the given reaction is a redox reaction.

 

(iii) CaO(s)  +  H2O(g)  →   Ca(OH)2aq

The reactions in which a compound reacts with water to produce other compounds are called hydrolysis reactions. The given reaction is hydrolysis.

 

(iv) 2AlCl3(g)   +   3H2O(I)   →  Al2O3(s)   + 6HCl(aq)

The reactions in which a compound reacts with water to produce other compounds are called hydrolysis reactions. The given reaction represents hydrolysis of AlCl3.

 

(v) Ca3N2(s)   +  6H2O(I)  →     3Ca(OH)2(aq)  + 2NH3(g)

The reactions in which a compound reacts with water to produce other compounds are called hydrolysis reactions. The given reaction represents hydrolysis of Ca3N2.

 


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